Histogram
Explorer is a tool for understanding measures of location (mean, median,
mode) and measures of dispersion (standard deviation, range and interquartile
range). It uses a histogram.
- Click the check box(es) of the statistics you are
interested in.
- Each checked statistic is now calculated and a
corresponding visual marker is added below the histogram, i.e. a mean triangle
is displayed below the bar that contains the mean, etc.
- Now drag the bars of the histogram to see how it affects
the statistics.
- Notice that the statistics are recalculated after each
change.
- From the Distributions menu (it's on the histogram
window) choose a type of distribution.
- This just sets the histogram to a common, interesting or
random set of data.
- NOTE: Uniform, Symmetric and Random distributions all
have more than one set of data. This means you get a different graph each time
you use choose them
Choose Practice Guessing from the Histogram
Explorer's File menu. This mode gives you a chance to guess the correct value
for each statistic. For each statistics selected a data entry box will appear.
Two buttons will also appear at the bottom of the screen. After filling in a
guess for each statistic click on the Check Guesses button. Answers will
be shown for only the statistics you attempted to answer. Your guess and the
answers will be erased each time the histogram is changed. |
an applet from
USFCA